This is a medium size Dalmation Jasper hand cut stone in a split shank ring design. This ring is a size 5 3/4 and can be sized from a 5 to a 7. The stone itself measures 24 by 11 mm or just over 7/8 by 3/8 inches. wide.
Other than information on Jasper in general, i have yet to find particular information on this specific stone. It looks to me like a form of mineralized breccia. It looks like random chunks of jasper in a sandy petrified matrix. Jasper is an opaque form of Chalcedony, which is a microcrystalline variety of the mineral Quartz. It often contains an abundance of impurities, and therefore some regard it as a rock instead of a mineral. Jasper is usually associated with brown, yellow, or reddish colors, but may be used to describe other opaque colors of Chalcedony such as dark or mottled green and orange. Some forms of Jasper are banded, and these banded Jaspers may appear similar to Agate, but unlike Agate they are opaque. When Jasper is dull and lacking interesting colors or patterns, it is not Jasper but rather Chert. - See more at: http://www.minerals.net/mineral/jasper.aspx#sthash.KsFIRXyW.dpuf
